The threat of violence, and the occasional outbreak of real violence—which gives the threat credibility—are essential elements in peaceful social change not only in international, but also in national communities. Individuals and groups, no less than nations, exploit the threat as an everyday matter. This induces flexibility and stability in democratic institutions.
I refer not only to the police power of the state and the recognized right of self-defense, but also to private individual or group violence, whether purposive or futile, deliberate or desperate. Violence and the threat of violence, far from being meaningful only in international politics, are underlying, tacit, recognized, and omnipresent facts of domestic life, in the shadow of which democratic politics are carried on. They instil dynamism into the structure and growth of the law, the settlement of disputes, the processes of accomodating interests, and they induce general respect for the verdict of the polls.